Escape all C0 and C1 control codes under escape_chars => 'nonascii' #58
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Along the way consolidates the five escaping passes in _escape_chars into a
single substitution, with the side effect of causing print_escapes to not
generate redundant color-switch codes.
(because it's quite annoying to dump a five-page data structure, then not be able to read it because somewhere near the beginning was a 0/14 SHIFT OUT switching my terminal to VT100 graphics mode.)